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United States of America Patent
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app pub date -
Oct 28, 2013
filing date -
Oct 29, 2012
priority date (Note) -
Abandoned
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Abstract
A bearing that provides contact force to engage a filament with a drive gear has a movable axis that can be controllably moved toward and away from the drive gear in order to engage and disengage the filament. A bearing is spring-biased toward the drive gear, and a bistable lever mechanism is provided with a first stable position in which the bearing is engaged with a filament and a second stable position in which the bearing is disengaged from the filament. By providing a mechanism that locks in both positions, loading and unloading of filament can be facilitated.
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